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\(\text{ a.135 x 345 + 675 : 135 }\)
\(=46575+5\)
\(=46580\)
\(\text{ b.15 400 : 25 : 4 }\)
\(=616:4\)
\(=154\)
\(\text{ c.1224 : 24 + 1416 : 24}\)
\(=\left(1224+1416\right):24\)
\(=2640:24\)
\(=110\)
học tốt
a.135x345+675:135
=46575+5
=46580
b.15400:25:4
=616:4
=154
c.1224:24+1416:24
=(1224+1416):24
=2640:24
=110
k đúng cho mình nha
a) \(15400:x=25\)
\(\Rightarrow x=15400:25\)
\(\Rightarrow x=616\)
b) \(\left(x+3\right):247=675:135\)
\(\Rightarrow\left(x+3\right):247=5\)
\(\Rightarrow x+3=5\times247\)
\(\Rightarrow x+3=1235\)
\(\Rightarrow x=1235-3\)
\(\Rightarrow x=1232\)
c) \(1224:\left(x-8\right)=24\)
\(\Rightarrow\left(x-8\right)=1224:24\)
\(\Rightarrow x-8=51\)
\(\Rightarrow x=51+8\)
\(\Rightarrow x=59\)
Bạn ghi kiểu gì mình không hiểu
Không có cái nào đúng
a,\(\frac{4}{3}\)x \(\frac{9}{8}\)x \(\frac{16}{15}\)x \(\frac{25}{24}\)
= \(\frac{5}{3}\)
b, \(\frac{4}{3}\)x \(\frac{9}{8}\)x \(\frac{16}{15}\)x \(\frac{25}{24}\)x \(\frac{36}{35}\)x \(\frac{49}{48}\)x \(\frac{64}{63}\)x \(\frac{81}{80}\)
= \(\frac{9}{5}\)
a) 4125 : 15 - 405 : 15 = ( 4125 - 405 ) : 15 = 3720 : 5 = 744
b) 25 x 5 x 4 x 3 = ( 25 x 4 ) x ( 5 x 3 ) = 100 x 15 = 1500
c) 236 x 20 - 36 x 20 = 20 x ( 236 - 36 ) = 20 x 200 = 4000
d) 15400 : 25 : 4 = 15400 : ( 25 x 4 ) = 15400 : 100 = 154
e) 1224 : 24 + 1416 : 24 = ( 1224 + 1416 ) : 24 = 110
\(\frac{4}{3}\times\frac{9}{8}\times...\times\frac{81}{80}=\frac{2^2}{1\times3}\times\frac{3^2}{2\times4}\times...\times\frac{9^2}{8\times10}\)
\(=\frac{2\times3\times4\times...\times9}{1\times2\times3\times...\times8}\times\frac{2\times3\times4\times...\times9}{3\times4\times5\times...\times10}\\ =\frac{9}{1}\times\frac{2}{10}=\frac{9}{5}\)
4/3.9/8.16/15.25/24.36/35.49/48.64/63.81/80
=3/2.16/15.25/24.36/35.49/48.64/63.81/80
=5/3.36/35.49/48.64/63.81/80
=7/4.64/63.81/80
=9/5
+
15 400 : 25 : 4 =616:4=154
1224 : 24 + 1416 : 24=51+59=110
1500 : 25 : 4
= 1500 : (25 x 4)
= 1500 : 100
= 15
1224 : 24 + 1416 : 24
= (1224 + 1416) : 24
= 2604 : 24
= 110